Silencer for internal-combustion engines



Nov. 10, 1953 F. TREMBLEY 2,658,580

SILENCER FOR INTERNAL-COMBUSTION ENGINES Filed Sept. 26, 1949 2 Sheets-Sheet l Wren rm? Nov. 10, 1953. F. TREMBLEY SILENCER FOR INTERNAL-COMBUSTION mamas 2 Sheets-Sheet 2 Filed Sept. 26, 1949 Patented Nov. 10, 1953 SILENOER FOR INTERNAL-COMBUSTION GIN ES Fernand Trembley, Bellerive, Geneva, Switzerland, assignor to Societe de Recherches Techniques et dExploitations Industrielles, Geneva, Switzerland, a corporation of Switzerland Application September 26, 1949, Serial No. 117,905

Claims priority, application Switzerland October 18, 1948 3 Claims.

The present invention relates to silencers for internal combustion engines particularly for automobile vehicles. The object of thesesilencers is to obtain a rapid and complete cooling of the exhaust gases without opposing any obstacle to their flow. It is known that the essential condition for obtaining silent operation of an engine is the cooling of the burnt gases.

It has for its subject more particularly a s1- lencer of novel construction and the combination of this silencer with the engine elements and the body work of the land, air or sea vehicle on whlch it is mounted. The silencer, of the present invention, for an internal combustion engine mounted on a land, air or sea vehicle, is formed by a thick casing of a metal which is a good conductor of heat through which the exhaust gases pass in the direction of its greatest length and provided internally, with fins parallel to the direction of flow of the exhaust gases and, externally, with fins parallel to the direction of flow of a stream of air resulting from the movement of the vehicle.

The hollow body formed by the thick casing may be separated longitudinally by a central partition provided with at least one orifice placing the two internal chambers of the silencer in communication, the inlet pipe for the exhaust gases leading into one of these chambers and the exhaust pipe placing the other of these chambers into communication with the outside.

In order to ensure the efiective skimming of the air over the part of the silencer which is located in the zone of aerodynamic depression, a sheet, forming a deflector, may partly surround the silencer at least at this part.

The silencer may be placed transversely to the longitudinal axis of the vehicle in a cell in the bottom of the front part of the said vehicle, the wall of the cell surroundin the upper and rear parts of the silencer and forming the deflector sheet above and the front and lower parts being exposed to the stream of direct air.

The longitudinal partition may be substantially vertical, the pipe i'or the exhaust gases leading into the front chamber and the exhaust pipe leaving the rear chamber.

A plate forming deflector may be located in the cavity of the silencer so as to deviate the flow of the exhaust gases and the exhaust pipe may pass along the body of the vehicle and opens at the rear of this in a zone of aerodynamic depression.

The pa y ng drawings show by way of example a form of construction of the device of the invention for a vehicle with a V-en i with two twin silencers, each receiving the exhaust gases from one of the groups of cylinders.

In these drawings:

Fig. 1 is a view from the front and under-- neath the vehicle.

Fig. 2 is a view of the top of the silencer.

Fig. 3 is a section on the line IIIIII of Fig. 21.

Fig. 4 is a section on the line IVIV of Fig. 3:.

Fig. 5 is a section on the line VV of Fig. 3..

The body I of the vehicle has on opposite sides: of a central plane, two cells 2 in which are 10-- cated two silencers 3 each receiving the exhaust; gases from one of the groups of cylinders of a. V-engine. The silencer 3 is formed by a hollow" body 4 formed by a thick casing of a metal which. is a good conductor of heat, having in the neigh-- borhood of its end near the central plane of the vehicle, at its upper part, an opening 5a surrounded by a collar 5 for the attachment of an. exhaust pipe supplying the exhaust gases of the engine and, at its lower portion, an exhaust pipe fitting 6. The two ends of the hollow body 4 are: closed by a plate la, lb, respectively, held in po-- sition by nuts 8 co-operating with screwed studs 9. Joints 9a, ensure fiuidtightness between the hollow body and the plates 7a and lb.

The interior of the hollow body 4 has longi-- tudinal fins I8 and two groups of fins Ila, lib arranged closely together forming mortices for retaining a central partition [2. The central partition I2 is interrupted adjacent the plate 1b and at a predetermined distance from this so as to establish communication between the two chambers l3 and [4 formed thereby in the interior of the hollow body 4. This arrangement causes the gases to sweep over the external plate lb.

The outside of the hollow body is provided with transverse fins l5 parallel to the longitudinal plane of the vehicle.

In the chamber I3, underneath the inlet 5a for the exhaust gases, a plate [6 cast integral with the plate lb, forms a deflector and deflects the exhaust gases entering perpendicularly into the axial direction of the silencer.

The exhaust gases entering at 5a are deviated by the plate and pass longitudinally through the chamber I3 whilst transferring their heat to the fins I 0 which line the chamber. They then pass through the gap I! provided between the partition I2 and the plate lb into the chamber l4 through which they also pass longitudinally in the opposite direction so as to escape through the exhaust pipe 6, which is connected to the pipe l8 located the transverse fins 15 provided on this portion.

facilitating the heat exchange between the mass of the hollow body and the stream of air. A,

second stream of air circulates over the outer and rear plates of the silencer betweenthefins l5:

provided on this part, the outerwall of the. hollow body and the wall IQ of the body -forming the cell 2.

Instead of a single opening I! placing, the

chambers 13 and M in communication, a number thereof may be provided.

The silencer described is preferably arranged transversely to the longitudinal axis of thevehicle in a cell at the bottom of the front portion of the vehicle.

For ensuring the effective passage of the air over the part ofthe silencer which is located in the zone of aerodynamic depression, a sheet, forming a deflector, partly surrounds the silencer at least at-this portion. This sheet is formed by the wall 19 of the cell surrounding the upper and rear partsof the silencer. The front and lower parts are exposed to the direct air stream. The internal longitudinal partition is substantially vertical and the inlet pipe for the exhaust gases leads into the front chamber, the exhaust pipe leaving the rear chamber.

I claim:

1, A mufiler for an internal combustion engine of a vehicle having a cell in its lower front portion open at the front'and bottom and closed at its top and rear, comprising an elongated hollow body having thick walls of a metal which, is a very good conductor of heat, said body having inlet and outlet openings for exhaust gases disposed to effect-the flow of gases longitudinally through the body, a plurality of fins projecting into the hollow body from the inner surfaces of its longitudinally extending Walls, said fins extending longitudinally of the hollow' body and parallel to the direction of gas flow through the,

body, and a plurality of fins on the outer surface of the walls of the hollow body extending in a direction parallel to the direction of flow of cooling air over the outer surface of the hollow body due to travelling movement of theyehicle, the inner fins being provided to remove thegreatest amount of heat possible from the exhaust gases in thehollowbody for transferto the outer fins and dissipation in the coolingair, said muffler being mounted in said cell with its internal fins extending transversely of the direction of movement of the vehicle and its external fins extending parallel to the direction of movement of the vehicle with the front and bottom portions of the muffler directly exposed and with the upper and rear portions of the muffler spaced from the upper and rear portions of the cell forthe deflection of .air over the upper and rear portions of the muffler by thecorresponding portions of thecell.

2. A muffler for aninternal combustion. engine mounted on a vehicle, comprising an'elongated hollow body having thick wallsof a metal which isa very goodconductor of. heat, a partition ex-. tending from, oneendof the, hollowybody to. .a region spaced from the other end thereof to divide the body into two longitudinally extending compartments communicating at said region, said body having inlet and, outlet openings at said one end on opposite sides-of the partition to effect longitudinal flow of gases serially through said compartments, a plurality of fins projecting into the hollow bodysfrom the inner surfaces of its longitudinally extending walls, said fins extending longitudinally of the hollow body and parallel tothedirection of gas flow through the body, and a plurality of fins on the outer surface of the walls of thehollow body extending in a direction parallel to the direction of flow of cooling air over theouter surface of the hollow body due to travelling m ovement of the vehicle, the inner fins beingprovided to remove the greatest amount of heat possible from the exhaust gases in the hollow body for transfer to the outer fins and dissipation in the cooling air.

3. Amuiller for an internal combustion engine mounted on a vehicle, comprising an elongated hollow body having thick walls of a metal which is a very goodconductor of heat, a partition extending from one end of the hollow body to a. region spaced from the other end thereof to divide the body into two longitudinally extending compartments communicating at said region, said body having inlet-andoutlet openings at said one end on opposite sides of the partition to effect longitudinal flow of gasesserially through said compartments, a plurality of finsprojecting into the hollow body from the inner surfaces of its longitudinally extending walls, said fins extending longitudinally of thehollow body and parallel to the direction of gas flow through the body, a plurality of fins on the outer surface of the walls of the hollowbody extending in a direction parallel to the direction of flow of cooling air over the outersurface of the hollow body due to travelling movement of the vehicle, the inner fins being provided to remove the greatest amount of heat possible from the exhaust gases in the hollow body for transfer to the outer fins and dissipation in the cooling air, and a deflector sheet partially surrounding the portion of the mufilerlocated in the zone of aerodynamic depression produced upon movement of the vehicle through air for effecting the flow of cooling air over the partially surrounded portion of the mufiler.

FERNAND TREMBLEY;

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 861,550 Strang July 30, 1907 877,431 Jones Jan. 21, 1998 1,032,794 Wolf Julylfi, 1912 1,490,957 Birger Apr. 22, 1924 1,725,878 McIntyre Aug. 27, 1929 1,732,909 Noblitt et al, Oct. 22, 1929 1,775,511 Chapman Sept. 9, 1930 2,244,809 Pascale June 10, 1941 2,484,826 Harley Oct. 18,1949

FOREIGN PATENTS Number Country Dat .00 rma ym Ap 26; .1910 2129 r ce. ---.--.---.--s M n 1, 1 420,347 Great Britain Nov. 29, 1934 

